ML0021 August 15, 2018
9 Copyright 2018 Bitronics, LLC
Definitions:
Installation Category (Overvoltage Category) III: Distribution Level, fixed installation, with
smaller transient overvoltages than those at the primary supply level, overhead lines, cable systems,
etc.
Pollution: Any degree of foreign matter, solid, liquid, or gaseous that can result in a reduction of
electric strength or surface resistivity of the insulation.
Pollution Degree 2: Only non-conductive pollution occurs except that occasionally a temporary
conductivity caused by condensation is to be expected.
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